The United States made a decision Tuesday to impose duties ranging from 10.36 percent to 15.78 percent on Chinese oil well pipes for alleged unfair subsidies.

"China is strongly opposed to the U.S. move of continuing with its discriminatory measures and arbitrarily raising the anti-subsidy duty rates," said Yao Jian, spokesman of the MOC.

Yao reiterated that the United States should live up to its promise made at the G20 Summit and the consensus reached earlier by leaders of the two countries to fight trade protectionism.

Earlier this month, the U.S. Commerce Department also slapped preliminary anti-dumping tariffs on the pipe up to 99 percent based on the allegation that "Chinese producers/exporters have sold OCTG (oil country tubular goods) in the United States at prices ranging from zero to 99.14 percent less than normal value."

Customs data showed that pipes involved were worth 3.2 billion U.S. dollars in 2008, taking up 46 percent of the total amount of Chinese steel products exported to the United States (6.9 billion dollars).

More than 90 companies were affected, including major steel companies like Baosteel, Tianjin Pipe and Ansteel.